Implement for loops

corpus/for.txt

@@ -0,0 +1,92 @@
+==================
+Simple For Loop
+==================
+
+for i in [1, 2, 3] {
+  (output i)
+}
+
+---
+
+(root
+  (item
+    (statement
+      (for
+        (identifier)
+        (expression
+          (value
+            (list
+              (expression
+                (value
+                  (integer)))
+              (expression
+                (value
+                  (integer)))
+              (expression
+                (value
+                  (integer))))))
+        (item
+          (statement
+            (expression
+              (function_call
+                (tool)
+                (expression
+                  (identifier))))))))))
+
+==================
+Complex For Loop
+==================
+
+for list in list_of_lists {
+  for item in list {
+    (output item)
+  }
+
+  if (length list) > 1 {
+    (output "List is long...")
+  }
+}
+
+---
+
+(root
+  (item
+    (statement
+      (for
+        (identifier)
+        (expression
+          (identifier))
+        (item
+          (statement
+            (for
+              (identifier)
+              (expression
+                (identifier))
+              (item
+                (statement
+                  (expression
+                    (function_call
+                      (tool)
+                      (expression
+                        (identifier))))))))
+          (statement
+            (if_else
+              (if
+                (expression
+                  (logic
+                    (expression
+                      (function_call
+                        (tool)
+                        (expression
+                          (identifier))))
+                    (logic_operator)
+                    (expression
+                      (value
+                        (integer)))))
+                (statement
+                  (expression
+                    (function_call
+                      (tool)
+                      (expression
+                        (value
+                          (string))))))))))))))

grammar.js

@@ -17,6 +17,7 @@ module.exports = grammar({
       $.select,
       $.while,
       $.async,
+      $.for,
     ),
   
     comment: $ => seq(/[#]+.*/),
@@ -242,6 +243,5 @@ module.exports = grammar({
       repeat($.statement), 
       '}'
     ),
-
   }
 });

src/grammar.json

@@ -54,6 +54,10 @@
         {
           "type": "SYMBOL",
           "name": "async"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "for"
         }
       ]
     },

src/node-types.json

@@ -117,6 +117,29 @@
       ]
     }
   },
+  {
+    "type": "for",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        },
+        {
+          "type": "identifier",
+          "named": true
+        },
+        {
+          "type": "item",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "function",
     "named": true,
@@ -379,6 +402,10 @@
           "type": "expression",
           "named": true
         },
+        {
+          "type": "for",
+          "named": true
+        },
         {
           "type": "if_else",
           "named": true